C++ note--string类的实现

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不引用标准库string的基础上实现string类的基本功能：

class MyString{public:MyString(const char *str = NULL); //普通构造函数MyString(const MyString &other);//拷贝构造函数~MyString(void);//析构函数MyString & operator =(constMyString &other);//赋值函数MyString & operator =(const char *str);private:char *m_data;//保存字符串};MyString::MyString(const char *str){if (str == NULL){m_data = new char[1];*m_data = '\0';}else{int length = strlen(str);m_data = new char[length];strcpy(m_data, str);}}MyString::MyString(const MyString &other){int length = strlen(other.m_data);m_data = new char[length+1]; // 最后一位为\0strcpy(m_data, other.m_data);}MyString::~MyString(void){delete []m_data;}MyString & MyString::operator=(const MyString &other){//检查自赋值if (this == &other)return *this;int length = strlen(other.m_data);m_data = new char[length+1];// 最后一位为\0strcpy(m_data, other.m_data);return *this;}MyString & MyString::operator=(const char *str){if (strcmp((*this).m_data, str) == 0)return *this;int length = strlen(str);m_data = new char[length + 1];strcpy(m_data, str);return *this;}

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